Wow, must vary by different local authority then! Though in both cases I referenced, the change was literally only to do with something fairly ordinary that wouldn’t normally involve planning: one was re-roofing the house, the other was rebuilding/repointing some chimneys.
In both the houses we have lived in I have sought advice from the conservation officer; different people have occupied the role through the years, but all have been friendly and helpful. Usually I drop an email along the lines of: we need to do x replace work to the house, it appears that planning is not required, what do you think? In general, the council do not want tons of paperwork so some things can be agreed by email. It’s nowhere near as stringent as listing, but they will follow process for all big things.
I guess I can see why people don’t like them, there is an additional layer of administration to working on your house, but it’s not excessive, and this restriction is what ensures the character of the area is retained. I’m a big fan, generally; it means the area is unlikely to change in appearance over time, and that every change that is made is considered against the overall street scene.
It’s a good place to live if: you like character (old) properties, and some degree of uniformity (our old house was very uniform, our new house less so because the houses are all individual); you want to know that next door can’t randomly become a student house or a mega mansion; you care about conservation of older houses (note, not preservation, this is not listing, and you can do some modern things with modern materials).
It’s a bad place to live if: you want to make big changes to the front of the property; you don’t like admin in general; you want to rip everything out and completely modernise (whilst internal changes are not restricted, there will likely be plenty of original features that arguably should stay).
We were talking the other day about the location of our street and if it weren’t for the Article 4 Directive the houses would likely have been bulldozed for flats and new builds now because they have massive plots. Indeed a few streets over that happened in the 60s and 70s